What’s Vulnerable › Vulnerabilities

CVE-2020-7695: HTTP Response Splitting

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-07-27 · updated 2026-06-17
• Weakness: CWE-74

Description

Uvicorn before 0.11.7 is vulnerable to HTTP response splitting. CRLF sequences are not escaped in the value of HTTP headers. Attackers can exploit this to add arbitrary headers to HTTP responses, or even return an arbitrary response body, whenever crafted input is used to construct HTTP headers.

Affected products

• uvicorn: before 0.11.7 — fixed in 0.11.7

How to fix

Upgrade to a fixed version: uvicorn 0.11.7. Check the vendor advisory for mitigations.

References

• https://github.com/encode/uvicorn
• https://snyk.io/vuln/SNYK-PYTHON-UVICORN-570471
• https://github.com/encode/uvicorn
• https://snyk.io/vuln/SNYK-PYTHON-UVICORN-570471

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